java - 如何解决有关变量的以下问题？

Question

我有一个类，里面有一个 baseDir 变量，定义如下：

public class experiment {
    for (int exp = 0; exp < experimentCnt; exp++) {
        String dirString = config.getClass().getSimpleName() + "_" + df.format(new Date());
        String baseDir = new File(homeDir + "/" + dirString).getAbsolutePath();
        System.out.println("Running simulation: " + dirString);

        setCurrentDirectory(baseDir);

        PrintWriter paramsLog = null;

        try {
            paramsLog = new PrintWriter(
                 new File("experimentParams.log").getAbsoluteFile(), "UTF-8");
            paramsLog.println(params);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

现在，我想在另一个类中使用那个 baseDir 变量。我怎样才能使它可访问？

Answer 1

与其在函数内部创建一个新变量，不如在函数外部创建一个公共变量。

public class experiment {

public String baseDir;

    for (int exp = 0; exp < experimentCnt; exp++) {
        String dirString = config.getClass().getSimpleName() + "_" + df.format(new Date());
        baseDir = new File(homeDir + "/" + dirString).getAbsolutePath();
        System.out.println("Running simulation: " + dirString);

        setCurrentDirectory(baseDir);

        PrintWriter paramsLog = null;

        try {
            paramsLog = new PrintWriter(
                 new File("experimentParams.log").getAbsoluteFile(), "UTF-8");
            paramsLog.println(params);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }